English verb conjugation
COULD FLUCTUATE

Regular verb: fluctuate - fluctuated - fluctuated

Affirmation

Simple form	V-ing form
I could fluctuate you could fluctuate he could fluctuate we could fluctuate you could fluctuate they could fluctuate	I could be fluctuating you could be fluctuating he could be fluctuating we could be fluctuating you could be fluctuating they could be fluctuating
Perfect	V-ing perfect
I could have fluctuated you could have fluctuated he could have fluctuated we could have fluctuated you could have fluctuated they could have fluctuated	I could have been fluctuating you could have been fluctuating he could have been fluctuating we could have been fluctuating you could have been fluctuating they could have been fluctuating

Negation

Simple form	V-ing form
I couldn't fluctuate you couldn't fluctuate he couldn't fluctuate we couldn't fluctuate you couldn't fluctuate they couldn't fluctuate	I couldn't be fluctuating you couldn't be fluctuating he couldn't be fluctuating we couldn't be fluctuating you couldn't be fluctuating they couldn't be fluctuating
Perfect	V-ing perfect
I couldn't have fluctuated you couldn't have fluctuated he couldn't have fluctuated we couldn't have fluctuated you couldn't have fluctuated they couldn't have fluctuated	I couldn't have been fluctuating you couldn't have been fluctuating he couldn't have been fluctuating we couldn't have been fluctuating you couldn't have been fluctuating they couldn't have been fluctuating

Interrogative form

Simple form	V-ing form
could I fluctuate? could you fluctuate? could he fluctuate? could we fluctuate? could you fluctuate? could they fluctuate?	could I be fluctuating? could you be fluctuating? could he be fluctuating? could we be fluctuating? could you be fluctuating? could they be fluctuating?
Perfect	V-ing perfect
could I have fluctuated? could you have fluctuated? could he have fluctuated? could we have fluctuated? could you have fluctuated? could they have fluctuated?	could I have been fluctuating? could you have been fluctuating? could he have been fluctuating? could we have been fluctuating? could you have been fluctuating? could they have been fluctuating?

Interro-negative form

Simple form	V-ing form
couldn't I fluctuate? couldn't you fluctuate? couldn't he fluctuate? couldn't we fluctuate? couldn't you fluctuate? couldn't they fluctuate?	couldn't I be fluctuating? couldn't you be fluctuating? couldn't he be fluctuating? couldn't we be fluctuating? couldn't you be fluctuating? couldn't they be fluctuating?
Perfect	V-ing perfect
couldn't I have fluctuated? couldn't you have fluctuated? couldn't he have fluctuated? couldn't we have fluctuated? couldn't you have fluctuated? couldn't they have fluctuated?	couldn't I have been fluctuating? couldn't you have been fluctuating? couldn't he have been fluctuating? couldn't we have been fluctuating? couldn't you have been fluctuating? couldn't they have been fluctuating?